Time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes

Abstract

A time slot scanning method that enables the capacitive touch screen to implement multiple scanning modes, where the said capacitive touch screen comprises the capacitance matrix and data processing modules that are electrically connected thereto; the said scanning method refers to a data acquisition mode where the signal scanning is initiated in a cycle and the received data generated due to scanning are acquired. The present invention enables the touch screen to execute multiple scanning modes with the time slot scanning method. Under the circumstances where the master scanning mode is executed, the scanning course of the slave scanning mode will be inserted in sections into the scanning course of the master scanning mode. Through the alternate use of the master scanning mode and slave scanning mode, the present invention is able to utilize the strengths of the master scanning and slave scanning are utilized to solve the issue that fails to be resolve by only one scanning mode used; in the meantime, the alternate use of the master scanning mode and slave scanning mode ensures the homogeneity of the data acquisition time, thus enabling the reliability of data; only part of the slave scanning mode is executed, so as to minimize the additional time consumption.

What is claimed is: 
     
         1 . A time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes, where the said capacitive touch screen comprises the capacitance matrix and data processing modules that are electrically connected thereto; the said scanning method refers to a data acquisition mode where the signal scanning is initiated in a cycle and the received data generated due to scanning are acquired; the said method is characterized in that it comprises the following steps:
 A. The said capacitive touch screen is equipped with hardware and software, enabling it to support the completion of multiple N+1 scanning modes, N≧1;   B. One of N+1 scanning modes as stated in Step A is chosen to be set as the master scanning mode for the said touch screen, and other scanning modes thereof are respectively set as No. 1 slave scanning mode, No. 2 slave scanning mode . . . No. N slave scanning mode;   The said master scanning mode obtains a master scanning data frame in its own master scanning cycle T P ; the said various slave scanning modes respectively obtain a slave scanning data frame in their respective own slave scanning cycles T 1 , T 2 , . . . , T N ;   C. The divided scanning is used to enable various slave scanning modes to obtain their respective slave scanning data, namely, the Mi section of the scanning data subframes that are obtained through the unrepeatable time division scanning in the No. i slave scanning mode make up the No. i slave scanning data, i=1, 2, . . . , N; Mi represents the quantity of scanning data subframes for the No. i slave scanning mode, Mi≧1; Suppose j=1, 2, . . . , Mi, the subframe scanning cycle used for obtaining the No. ij scanning data subframe in the No. i slave scanning mode is tij, then:   
       
         
           
             
               
                 
                   
                     ∑ 
                     
                       j 
                       = 
                       1 
                     
                     
                       M 
                       i 
                     
                   
                    
                   
                     t 
                     ij 
                   
                 
                 = 
                 
                   T 
                   i 
                 
               
               ; 
             
           
         
         D. In a scanning cycle T, a master scanning data frame is obtained in a master scanning cycle T P , and the respective sections of the No. ij subframe scanning cycle tij for various slave scanning modes are used to obtain N No. ij scanning data subframes. i.e. T=T P +t 1j +t 2j + . . . +t Nj ; that is to say, as for the No. i slave scanning mode, both the Mi master data frames and a No. i slave scanning data frame are obtained after Mi scanning cycles T have passed. 
       
     
     
         2 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 The said Step D further comprises the following substeps: 
 D1. In a scanning cycle T, first a master scanning data frame is obtained in a master scanning cycle T P , and then N No. ij scanning data subframes are obtained in the respective sections of the subframe scanning cycle tij for various slave scanning modes. 
 
     
     
         3 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 2  is characterized in that:
 The said substep D1 further comprises the following substeps: 
 D11. Suppose i=1 and the divided counting variation for slave scanning as x i , and set x 1 =x 2 = . . . =x N =1; 
 D12. A master scanning data frame is obtained in the master scanning mode after a master scanning cycle T P  passes; 
 D13. Suppose j=x i , the No. ij scanning data subframe is obtained in the No. i slave scanning mode after a subframe scanning cycle t ij  passes. 
 D14. Judge whether x i  equals M i ; 
 If x i =M i , set x i  as 1; 
 If x i ≠M i , set the value of x i +1 as the current value of x i ; 
 D15. Judge whether i equals N; 
 If i=N, set the value of i as 1 and execute Step D12; 
 If i≠N, set the value of i+1 as the current value of I and execute Step D13. 
 
     
     
         4 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 The said Step D further comprises the following substeps: 
 D2. The master scanning data are obtained by using the divided scanning in the said master scanning mode, thus enabling the composition of the master subsection of scanning data completed by Q sections of master subsection scanning cycles; the composition of various scanning data subframes can also be achieved through the subdivided scanning, enabling the composition of the scanning data subframe completed by the subsection subframe scanning cycle for the No. ij scanning data subframe; 
 In a scanning cycle T, the following processes are executed in cycles for Q times, 
 first a master subsection of scanning data is obtained in the master subsection scanning cycle, and then N subsections of scanning data subframes are obtained in the respective subsections of subframe scanning cycles for various subscanning modes. 
 
     
     
         5 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 The said Step D2 further comprises the following substeps: 
 D21. The master scanning data are obtained by using the divided scanning in the said master scanning mode, namely, Q sections of the master subsection of the scanning data that are obtained through the unrepeatable time division scanning of the master scanning mode make up the said master scanning data; suppose y=2, 3, . . . , Q, the master subsection scanning cycle used for obtaining the No. y master subsection of scanning data in the said master scanning mode is t y , then: 
 
       
         
           
             
               
                 
                   
                     ∑ 
                     
                       y 
                       = 
                       1 
                     
                     Q 
                   
                    
                   
                     t 
                     y 
                   
                 
                 = 
                 
                   T 
                   P 
                 
               
               ; 
             
           
         
         Q sections of No. ijy subsection of the scanning data subframe is obtained through the unrepeatable time subdivision scanning of the No. ij section of the scanning data subframe in the said No. i slave scanning mode; the subsection subframe scanning cycle used for obtaining the said No. ijy subsection of the scanning data subframe is t ijy , then: 
       
       
         
           
             
               
                 
                   
                     ∑ 
                     
                       y 
                       = 
                       1 
                     
                     Q 
                   
                    
                   
                     t 
                     ijy 
                   
                 
                 = 
                 
                   t 
                   ij 
                 
               
               ; 
             
           
         
         D22. Suppose i=1, y=1; suppose divided counting variation for slave scanning as x i , and set x 1 =x 2 = . . . =x N =1; 
         D23. y sections of master scanning data are obtained in the master scanning mode after the master subsection scanning cycle t ijy  passes; 
         D24. Suppose j=x i , the No. ijy subsection of the scanning data subframe is obtained in the No. i slave scanning mode after a subframe scanning cycle t ijy  passes; 
         D25. Judge whether i equals N; 
         If i=N, set the value of i as 1 and execute Step D26; 
         If i≠N, set the value of i+1 as the current value of i and execute Step D24; 
         D26. Judge whether y equals Q; 
         If y=Q, set the value of y as 1 and execute Step D27; 
         If y≠Q, set the value of y+1 as the current value of y and execute Step D23; 
         D27. Judge whether x i  equals M i ; 
         If x i =M i , set x i  as 1; 
         If x i ≠M i , set the value of x i +1 as the current value of x i ; 
         D28. Judge whether i equals N; 
         If i=N, set the value of i as 1 and execute Step D23; 
         If i≠N, set the value of i+1 as the current value of and execute Step D27. 
       
     
     
         6 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 Apart from Step D, the following steps are included: 
 E. When it is needed to change the master scanning mode, the current master scanning mode is set as the slave scanning mode; A slave scanning mode selected is set as the master scanning mode and Step C to Step E are executed. 
 
     
     
         7 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the scanning mode as stated in Step A comprises the mutual capacitance scanning mode and mutual capacitance noise detection scanning mode, i.e. N=1; 
 the said mutual capacitance scanning mode refers to a scanning mode where the capacitive touch screen obtains the data on coordinates of the position touched by the touch screen by means of acquiring the mutual capacitance value for the capacitance matrix; 
 the said mutual capacitance noise detection scanning mode refers to the scanning mode where the data processing module for the capacitive touch screen continuously sends two pumping signals at the transmission channel connected to the capacitance matrix and the noise data for the capacitive touch screen is obtained by means of comparing the feedback signals generated by two pumping signals at the receiving channel corresponding to such transmission channel; or it means a scanning mode where no pump signals are sent by the data processing module for the capacitive touch screen, the noise data for the mutual capacitance touch screen is obtained by comparing the threshold values preset by the signal & data processing modules that are received at the receiving channel connected to the capacitance matrix; the capacitance matrix refers to the mutual capacitance matrix. 
 
     
     
         8 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the scanning mode as stated in Step A comprises the working scanning mode with the frequency of F 2  and the default system calibration scanning mode with the frequency of F 1 , i.e. N=1; 
 the said capacitive touch screen takes F 1  as the scanning frequency to obtain the original scanning data which is stored in the memory of such capacitive touch screen; 
 the said default system calibration scanning mode refers to the scanning mode where the scanning data obtained with the scanning frequency of F 1  are compared with the said original scanning data, so as to judge whether the touch of the touch screening is true; 
 the said working scanning mode refers to the scanning mode where the data on coordinates of the position touched by the touch screen with the working frequency of F 2  (F 2 ≠F 1 ). 
 
     
     
         9 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the scanning mode as stated in Step A comprises the mutual capacitance scanning mode and self-capacitance scanning mode, i.e. N=1; 
 the said mutual capacitance scanning mode refers to the scanning mode where the data on coordinate of the position touched by the touch screen is obtained when the capacitive touch screen works in the mutual capacitance touch screen mode; 
 the said self-capacitance scanning mode refers to the scanning mode where the data on coordinate of the position touched by the touch screen is obtained when the capacitive touch screen works in the self-capacitance touch screen mode. 
 
     
     
         10 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the scanning mode as stated in Step A comprises the standard electrode width scanning mode and electrode widened width scanning mode, i.e. N=1; 
 the said standard electrode width scanning mode refers to the scanning mode where the data on coordinates of the position touched by the touch screen when the standard width is kept among electrodes of the capacitive touch screen; 
 the said standard electrode widened width scanning mode refers to the scanning mode where the data on coordinates of the position touched by the touch screen when the electrode connecting relation is switched to enable the width among electrodes to exceed the said standard width. 
 
     
     
         11 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the electromagnetic screen and its data processing modules are additionally mounted to the capacitive touch screen as stated in Step A; the scanning mode as stated in Step A comprises the capacitive screen scanning mode and electromagnetic screen scanning mode, i.e. N=1; 
 the said mutual capacitance scanning mode refers to the scanning mode where the data on coordinate of the position touched by the touch screen is obtained when the capacitive touch screen works in the mutual capacitance touch screen mode or self-capacitance touch screen mode; 
 the said electromagnetic screen scanning mode refers to the scanning mode where the data on coordinate of the position touched by the touch screen is obtained when the electromagnetic screen is enabled and the capacitive touch screen works in the electromagnetic screen mode. 
 
     
     
         12 . The time slot scanning method enabling the capacitive touch screen to implement multiple scanning modes according to  claim 1  is characterized in that:
 the scanning mode as stated in Step A comprises the human touch scanning mode and capacitance pen scanning mode, i.e. N=1; 
 the said human touch scanning mode refers to the scanning mode where the data on coordinates of the position touched by the touch screen when the capacitive touch screen takes human bodies as the sensed touching object; 
 the said capacitance pen scanning mode refers to the scanning mode where the data on coordinates of the position touched by the touch screen when the capacitive touch screen takes capacitance pens as the sensed touching object.